LWJGL Forum

I'm trying to blend images using the built in alpha layer on my 32-bit .bmp, but it's not working right. Instead of using the alpha layer is uses the default black values in the image for transparency. I'm wondering if there's a problem in how I'm loading the file. The code I'm using is modified from a tutorial from NeHe Productions, put into a static class and goes like this:


public static int loadBMP32(String path, Object parent)
{
       IntBuffer image = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
       IL.ilGenImages(image);
       IL.ilBindImage(image.get(0));

       InputStream is = new BufferedInputStream( parent.getClass().getResourceAsStream(path));

       try
       {
       ByteBuffer bb = ByteBuffer.allocateDirect(is.available()).order(ByteOrder.nativeOrder());
       byte[] ba = new byte[(int)is.available()];
       is.read(ba);
       bb.put(ba);
       bb.clear();
       IL.ilLoadL(IL.IL_BMP,bb);
       IL.ilLoadFromStream(is,IL.IL_BMP);
       is.close();
       }
       catch(IOException ioe)
       {
        System.out.println("screwed");
       }
       
       IL.ilConvertImage(IL.IL_RGBA, IL.IL_BYTE);
       ByteBuffer scratch = ByteBuffer.allocateDirect(IL.ilGetInteger(IL.IL_IMAGE_WIDTH) * IL.ilGetInteger(IL.IL_IMAGE_HEIGHT) * 4);
       IL.ilCopyPixels(0, 0, 0, IL.ilGetInteger(IL.IL_IMAGE_WIDTH), IL.ilGetInteger(IL.IL_IMAGE_HEIGHT), 1, IL.IL_RGBA, IL.IL_BYTE, scratch);
       
       // Create A IntBuffer For Image Address In Memory
       IntBuffer buf = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
       GL11.glGenTextures(buf); // Create Texture In OpenGL

       GL11.glBindTexture(GL11.GL_TEXTURE_2D, buf.get(0));
       // Typical Texture Generation Using Data From The Image

       // Linear Filtering
       GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
       // Linear Filtering
       GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
       // Generate The Texture
       GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA, IL.ilGetInteger(IL.IL_IMAGE_WIDTH),
               IL.ilGetInteger(IL.IL_IMAGE_HEIGHT), 0, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, scratch);

       return buf.get(0); // Return Image Address In Memory
   }


Is there a reason why you dont use 32bit tgas instead? :?

We're using Photoshop to create the images and every time we try to save one as a 32-bit targa, the file inevitably ends up as 24-bit targa. The .bmp extension has no problem saving as 32-bit.

I'd love to use .tga files, so if anyone knows how to make one that's 32-bit I'm all ears.

Hey, figured out how to make 32-bit targa files in the GIMP. With just a quick change to the file type above the code works fine. Cool, thanks for the suggestion.